[ 16.305398] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.005897] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.344471] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 21.190120] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) [ 23.585352] random: sshd: uninitialized urandom read (32 bytes read, 106 bits of entropy available) Warning: Permanently added '10.128.15.240' (ECDSA) to the list of known hosts. [ 28.991225] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) executing program [ 29.104436] device syz0 entered promiscuous mode [ 29.147861] ------------[ cut here ]------------ [ 29.152700] WARNING: CPU: 0 PID: 3324 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 29.161579] syz0: caps=(0x00000080000048c1, 0x0000000000000000) len=56 data_len=0 gso_size=3 gso_type=20 ip_summed=0 [ 29.172446] Kernel panic - not syncing: panic_on_warn set ... [ 29.172446] [ 29.179800] CPU: 0 PID: 3324 Comm: syzkaller736055 Not tainted 4.4.110-gd891a62 #19 [ 29.187573] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.196908] 0000000000000000 162a662e8cb5e28d ffff8801d1137428 ffffffff81d04e3d [ 29.204995] ffffffff83842f60 ffff8801d1137500 ffffffff83ca9d60 0000000000000009 [ 29.213003] 0000000000000991 ffff8801d11374f0 ffffffff814197fa 0000000041b58ab3 [ 29.220997] Call Trace: [ 29.223559] [] dump_stack+0xc1/0x124 [ 29.228894] [] panic+0x1aa/0x388 [ 29.233875] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 29.240769] [] ? warn_slowpath_common+0x10a/0x140 [ 29.247225] [] warn_slowpath_common+0x125/0x140 [ 29.253521] [] ? skb_warn_bad_offload+0x2af/0x390 [ 29.259989] [] warn_slowpath_fmt+0xc1/0x110 [ 29.265934] [] ? warn_slowpath_common+0x140/0x140 [ 29.272392] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 29.279282] [] ? ___ratelimit+0x53/0x3e0 [ 29.284958] [] skb_warn_bad_offload+0x2af/0x390 [ 29.291250] [] __skb_gso_segment+0x3b3/0x4a0 [ 29.297272] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 29.304865] [] validate_xmit_skb_list+0xae/0x110 [ 29.311238] [] sch_direct_xmit+0x34f/0x760 [ 29.317088] [] ? dev_deactivate_queue.constprop.34+0x150/0x150 [ 29.324687] [] __dev_queue_xmit+0x1368/0x1a70 [ 29.330805] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 29.337007] [] ? netdev_pick_tx+0x310/0x310 [ 29.342955] [] ? tun_select_queue+0x1c8/0x380 [ 29.349065] [] ? tun_chr_ioctl+0x40/0x40 [ 29.354742] [] ? tun_chr_ioctl+0x40/0x40 [ 29.360417] [] dev_queue_xmit+0x17/0x20 [ 29.366008] [] packet_sendmsg+0x29b2/0x47e0 [ 29.371949] [] ? avc_has_perm_noaudit+0x460/0x460 [ 29.378407] [] ? packet_cached_dev_get+0x200/0x200 [ 29.384959] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 29.392024] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 29.398481] [] ? security_socket_sendmsg+0x89/0xb0 [ 29.405033] [] ? packet_cached_dev_get+0x200/0x200 [ 29.411579] [] sock_sendmsg+0xca/0x110 [ 29.417083] [] sock_write_iter+0x226/0x3b0 [ 29.422932] [] ? avc_has_perm_noaudit+0x460/0x460 [ 29.429390] [] ? sock_sendmsg+0x110/0x110 [ 29.435155] [] ? iov_iter_init+0xaf/0x1d0 [ 29.440920] [] __vfs_write+0x33c/0x450 [ 29.446435] [] ? __vfs_read+0x440/0x440 [ 29.452035] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.458156] [] ? selinux_file_permission+0x348/0x460 [ 29.464876] [] ? rw_verify_area+0x100/0x2f0 [ 29.470817] [] vfs_write+0x18a/0x530 [ 29.476149] [] SyS_write+0xd9/0x1b0 [ 29.481399] [] ? SyS_read+0x1b0/0x1b0 [ 29.486823] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 29.493372] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 29.500450] Dumping ftrace buffer: [ 29.504017] (ftrace buffer empty) [ 29.507696] Kernel Offset: disabled [ 29.511310] Rebooting in 86400 seconds..